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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Certain security applications ask you to move your mouse for a while in order to obtain some random data. This may be cheap but it produces random data at a very low rate, so it's not practical for my one-time-pad.

What are some good ways to produce a lot of truly random data fast, and at a low cost?

People using cameras do it in the dark, or with the lens capped, by removing the infrared filter and sensing black-body radiation as the source of noise. But why not regular videos of chaotic things like crowds of people or rain? Surely after 20 years of mpeg there must be people who know enough about imaging to isolate the pure noise?